ISO/IEC 14543-4-301:2020

ISO/IEC 14543-4-301
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
colour
inside
Information technology – Home Electronic System (HES) architecture –
Part 4-301: Application protocols for home air conditioners and controllers

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ISO/IEC 14543-4-301
Edition 1.0 2020-06
INTERNATIONAL
STANDARD
colour
inside
Information technology – Home Electronic System (HES) architecture –

Part 4-301: Application protocols for home air conditioners and controllers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 35.240.67 ISBN 978-2-8322-8494-0

– 2 – ISO/IEC 14543-4-301:2020
 ISO/IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 8
4 Conformance . 9
5 Connection configuration . 9
6 Application layer . 10
6.1 General . 10
6.2 NECD objects . 10
6.3 NECD services. 10
6.4 Object-specific NECD properties . 11
6.5 Application operation . 12
6.5.1 General . 12
6.5.2 Continuous requests . 12
6.5.3 Response wait timer value for controllers . 12
6.5.4 Resending a frame . 13
6.5.5 Processing object property counter . 13
6.5.6 Property values of write requests . 13
7 Normal operation . 13
7.1 General . 13
7.2 Start-up operation . 14
7.2.1 General . 14
7.2.2 Start-up processing of NECD nodes . 14
7.2.3 Search processing . 15
7.2.4 Obtaining NECD attribute information . 15
7.2.5 Obtaining home air conditioner attribute information . 16
7.3 Periodical operation . 16
7.4 Occasional operation . 16
7.4.1 General . 16
7.4.2 Obtaining home air conditioner status . 16
7.4.3 Controlling home air conditioners . 17
7.5 Operation during fault status . 18
8 Remote control . 19
8.1 General . 19
8.2 Processes to be carried out by controllers on remote control . 19
9 Considerations on controllers . 22
9.1 General . 22
9.2 Restrictions by home air conditioner implementations . 22
9.3 Processable number of object property counter. 24
9.4 Status synchronization by controllers (periodical operation) . 24
9.5 Reading fault status . 26

 ISO/IEC 2020
Annex A (informative) Terms and NECD frame format on ISO/IEC 14543-4-3 and
IEC 62394. 27
A.1 Terms correspondence between ISO/IEC 14543-4-3 and IEC 62394 . 27
A.2 NECD frame format . 27

Figure 1 – Relationship between IEC 62394, ISO/IEC 14543-4-3 and ISO/IEC 14543-4-301 . 5
Figure 2 – Connection configurations . 9
Figure 3 – Assumed network stack . 10
Figure 4 – Example of normal operation sequences . 14
Figure 5 – Example of sequence for obtaining NECD attribute information . 15
Figure 6 – Sequence to obtain status of home air conditioners. 17
Figure 7 – Sequence to control home air conditioners . 18
Figure 8 – Remote control . 19
Figure 9 – Remote control sequence (properties are written one by one) . 21
Figure 10 – Remote control sequence (properties are written in a batch) . 22
Figure 11 – Status synchronization flow by controllers . 25
Figure 12 – Obtaining detailed fault status information . 26
Figure A.1 – NECD frame format. 28

Table 1 – NECD objects . 10
Table 2 – NECD services . 11
Table 3 – NECD properties of device object (super class) . 11
Table 4 – NECD properties of device object . 12
Table 5 – Response wait timer value for controllers . 12
Table A.1 – Terms correspondence table between ISO/IEC 14543-4-3 and IEC 62394 . 27

– 4 – ISO/IEC 14543-4-301:2020
 ISO/IEC 2020
INFORMATION TECHNOLOGY –
HOME ELECTRONIC SYSTEM (HES) ARCHITECTURE –

Part 4-301: Application protocols for
home air conditioners and controllers

FOREWORD
1) ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)
form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC
participate in the development of International Standards through technical committees established by the
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International Standard ISO/IEC 14543-4-301 has been prepared by subcommittee 25:
Interconnection of information technology equipment, of ISO/IEC joint technical committee 1:
Information technology.
The list of all currently available parts of the ISO/IEC 14543 series, under the general title
Informati
...